this.getQueryVar = function(value_s)
{
    var query = location.search.substring(1);
    var varsArray = query.split("&");

    for (var i=0; i < varsArray.length; i++)
    {
        var keyvalArray = varsArray[i].split("=");

        if (keyvalArray[0] == value_s)
        {
            return unescape(keyvalArray[1]);
        }
    }
};

this.setReceiverEmail = function()
{
	document.aanmeld_form.__receiver_email__.value = this.getQueryVar('email');
};